Locking clip for hand pumps

ABSTRACT

A tubular lock, surrounding the reciprocable plunger of a hand pump, between the liquid discharge head and the plunger guiding collar, holds the plunger extended until rotated to a position where a slot in the lock clears a rib in the head, whereupon a portion of the lock becomes housed within a cavity in the head during normal pumping operations.

United States Patent RH i 1 Inventor Wallace F. Magers Leawood, Kans.

Appl No. 836,710

Filed June 26, 1969 Patented July 6, 9171 Assignee Cook Chemical Company Kansas City, Mo.

LOCKING CLIP FOR "AND PUMPS 501 Field of Search 103 202, 153; 230/202, 172; 222/348, 384, 402;417/238, 437; 92/23, 24, 25, 2e

[56] References Cited UNITED STATES PATENTS 3,185,355 5/1965 Lipman 3,489,322 1/1970 Ayres Primary Examiner-Robert M. Walker Attorney Schmidt, Johnson. Hovey & Williams ABSTRACT: A tubular lock, surrounding the reciprocable 8 Clmmsflnrawmg plunger of a hand pump, between the liquid discharge head U.S.Cl 92/23, and the plunger guiding collar, holds the plunger extended 222/402 until rotated to a position where a slot in the lock clears a rib lnt. Cl ..Fl5b 15/26, in the head, whereupon a portion of the lock becomes housed 865d 83/06 within a cavity in the head during normal pumping operations.

a4 'mmp-m ,1 i all II LOCKING CLIP FOR HAND PUMPS An important object of my present invention is to provide a lock to prevent depression of the reciprocable plunger of a hand pump during shipment and storage, and designed in such manner as to be carried out of the way by the liquid discharge head when rotated to a released position.

Another important object of the instant invention is to provide a lock of the aforementioned character which is not likely to become accidentally released during shipment or storage and which is not likely to be broken or otherwise rendered in operable during the entire life of the pump itself.

Still another important object of the present invention is the provision of a lock for the purposes above-outlined which, from the standpoint of use by the public generally, is neither difficult to understand nor complicated in operation.

In the drawing:

FIG. 1 is a top plan view of the hand pump shown in FIGS. 2 and 3 with which the locking clip of my present invention is adapted to be used;

FIG. 2 is a side elevational view of the pump, partially in section along line 2-2 of FIG. 1, illustrating the locking clip in its locking position;

FIG. 3 is a -view similar to FIG. 2 illustrating the lock released and the plunger depressed;

FIG. 4 is a fragmentary, cross-sectional view taken on line 4-4 of FIG. 3;

FIG. 5 is a crosssectional view taken on line 5-5 of FIG. 3;

FIG. 6 is an elevational view of the locking clip entirely removed from the pump; and

FIG. 7 is a cross-sectional view taken on line 7-7 of FIG. 6.

Pump It) with which lock 12 of my present invention is adapted to be used includes a barrel 14 provided with a dip tube 16, both of which are normally within a liquid container (not shown) and having a threaded neck which receives a rotatable cap 18 beneath collar 20, all as substantially shown in more detail, for example, in US. Pat. Nos. 2,870,943; 3,064,865; and 3,229,863.

Collar 20 reciprocably receives a tubular plunger 22 upon the outermost end of which is rigidly secured a discharge head 24 having a finger depression 26, a nozzle 23 provided with a discharge passage 30, and a plunger receiving bore 32 which places the outer open end of the plunger 22 in communication with the passage 30.

Lock I2 is in the nature of a tubular body 34 having a continuous ring portion 36 at one end thereof adjacent a boss 38 which surrounds the body 34, there being a longitudinal slot 40 in the body 34 extending from the boss 38 to that end of body 34 opposite to ring 36.

The body 34 surrounds plunger 22 and is normally interposed between head 24 and collar 20 as shown in FIG. 2 with ring 36 surrounded by an annulus 42, integral with collar 20 and presenting a recess 44 for receiving the ring 36. When the lock 12 is in the position illustrated in FIG. 2, the rounded innennost annular end 46 of the body 34 may abut the bottom of recess 44 or the boss 38 may abut the outermost annular edge of the annulus 42, or both, but there should be no tight jamming frictional fit of the ring 36 within the recess 44, and therefore, the inside diameter of the recess 44 is slightly larger than the outside diameter of the ring 36. Moreover, in order to reduce friction between the lock 12 and the plunger 22, the only interengagement between such parts is in a number of flat surfaces 48 within the ring 36 and tangent thereto.

The head 24 is provided with a cavity 50 which only partially surrounds the plunger 22, presenting a rib 52 which normally abuts the outer end 54 of the body 34 to prevent movement of the head 24 toward the collar 20 and therefore inward movement of the plunger 22 with respect to collar 20.

Body 34 is provided with an extended portion 56 which remains in cavity 50 at all times and which is less than 180 in length, the ends of the portion 56 serving as stops which engage the rib 52 and limit the extent of rotation oflock 12, one of such ends of the portion 56 constituting the outer end of one side of slot 40. A portion of the boss 38 is knurled to facilitate finger manipulation and an inclined portion of the outer surface of boss 38 may be provided with indicia as shown in FIG. 6, showing the operator that release of the lock 12 is effected by rotational movement imparted thereto.

When slot 40 is out of alignment with the rib 52 as shown in FIG. 2, head 24 and plunger 22 cannot be depressed because ends 46 and 54 of lock 212 are in abutting relationship to collar 20 and rib 52 respectively.

Lock I2 is released by rotation of body 34 through use of boss 38 until the slot 40 is aligned with the rib 52 whereupon, as the head 24 is depressed, that portion of the body 34 within which the slot 40 is formed becomes housed within cavity 50 as illustrated in FIG. 3 until portion 56 of body 34 bottoms within the cavity 50. The frictional interengagement between body 34 and head 24 within cavity 50 is sufficient to hold the lock 12 attached to the head 24 so that, as the head 24 is reciprocated during the pumping action, lock 12 reciprocates therewith.

At the end of the pumping operation, the operator may, if he so desires, withdraw the body 34 from within the cavity 50 and rotate the lock 112 to the position illustrated in FIG. 2, thereby again locking the plunger 22 against inward movement during storage.

Having thus described the invention, what I claim as new and desired to be secured by Letters patent is:

1. In a pump having a reciprocable plunger extending outwardly beyond one end thereof and a head on the outermost end of the plunger, means for releasably holding the plunger extended outwardly and against inward movement comprisa lock normally interposed between the head and said one end of the pump in abutting relationship thereto,

said lock being shiftable to a position clearing the head for movement of the latter toward? said one end of the pump, said lock being mounted on the plunger for rotation thereon to and from said position,

said lock being tubular and in surrounding relationship to the plunger with its ends normally abutting the head and said one end of the pump,

said head having a rib normally abutting the proximal end of the lock,

said lock having a slot for clearing the rib when the lock is rotated to said position,

said head having a cavity for receiving a portion of the lock upon movement of the head toward said one end of the pump after the lock is rotated to said position,

said cavity receiving said portion of the lock in frictional engagement of the head with the lock whereby the latter reciprocates with the head during continued movement of the head toward and away from said one end of the pump.

2. In a pump as claimed in claim 1, said lock being provided with stops at said rib-abutting end thereof disposed for engagement with the rib to limit the extent of rotation of the lock relative to the head.

3. In a pump as claimed in claim 2,

said one end of the pump comprising the outermost surface of a collar reciprocably receiving the plunger,

said collar having a recess normally receiving the adjacent end of the lock.

4. In a pump as claimed in claim 3,

said lock having a finger-manipulable boss therearound for rotating the same.

5. In a pump as claimed in claim 4,

said slot extending from the boss to said rib-abutting end of the lock,

said cavity partially surrounding the plunger and extending circumferentially in opposite directions from said rib.

6. In a pump having a collar, a plunger extending through the collar, and a head rigid to one end of the plunger and provided with a rib, said plunger being reciprocable within the collar for movement of the head toward and away from the collar during reciprocation of the plunger, a lock for releasably holding the head spaced away from the collar, said lock comprising:

an elongated tube separate from the head, the plunger and the collar, said tube surrounding the plunger between the head and the collar, one end of the tube being adjacent the head, the opposite end of the tube being adjacent the collar, said tube having a longitudinal slot open at said one end of the tube and adapted to receive the rib, said slot extending from said one end of the tube toward the collar and having a terminus in spaced relation to saidopposite end of the tube, said tube being rotatable with respect to the head, the plunger and the collar about the axis of reciprocation of the plunger from a first position disposing said one end of the tube in abutting relation to the rib and the opposite end of the tube in abutting relation to the collar, to a second position aligning the slot with the rib for movement of the latter along the slot toward said terminus as the head is moved toward the collar.

7. In a pump as claimed in claim 2,

said head having a cavity for receiving the tube when the latter is in said second position and as the head is moved toward the collar.

8. ln a pump as claimed in claim 2,

said head and said collar each being provided with means rotatably receiving the tube and holding the axis of rotation thereof fixed relative to the plunger.

P0405) UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No- 3.590.691 Dated July 6 1971 Inventor(s) WALLACE F. MAGERS It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

T Front page, the issue year of the patent "9171" should read 1971 Column 4, line 7, the claim reference numeral 4'2" should read 6 line 8, claim reference numeral "2 should read 6 Signed and sealed this 21st day of March 1972 (SEAL) Attest:

EDWARD M.F'LETCHER,JR. ROBERT GO'I'TSCHALK Ate-eating Officer Commissioner of Patents 

1. In a pump having a reciprocable plunger extending outwardly beyond one end thereof and a head on the outermost end of the plunger, means for releasably holding the plunger extended outwardly and against inward movement comprising; a lock normally interposed between the head and said one end of the pump in abutting relationship thereto, said lock being shiftable to a position clearing the head for movement of the latter toward said one end of the pump, said lock being mounted on the plunger for rotation thereon to and from said position, said lock being tubular and in surrounding relationship to the plunger with its ends normally abutting the head and said one end of the pump, said head having a rib normally abutting the proximal end of the lock, said lock having a slot for clearing the rib when the lock is rotated to said position, said head having a cavity for receiving a portion of the lock upon movement of the head toward said one end of the pump after the lock is rotated to said position, said cavity receiving said portion of the lock in frictional engagement of the head with the lock whereby the latter reciprocates with the head during continued movement of the head toward and away from said one end of the pump.
 2. In a pump as claimed in claim 1, said lock being provided with stops at said rib-abutting end thereof disposed for engagement with the rib to limit the extent of rotation of the lock relative to the head.
 3. In a pump as claimed in claim 2, said one end of the pump comprising the outermost surface of a collar reciprocably receiving the plunger, said collar having a recess normally receiviNg the adjacent end of the lock.
 4. In a pump as claimed in claim 3, said lock having a finger-manipulable boss therearound for rotating the same.
 5. In a pump as claimed in claim 4, said slot extending from the boss to said rib-abutting end of the lock, said cavity partially surrounding the plunger and extending circumferentially in opposite directions from said rib.
 6. In a pump having a collar, a plunger extending through the collar, and a head rigid to one end of the plunger and provided with a rib, said plunger being reciprocable within the collar for movement of the head toward and away from the collar during reciprocation of the plunger, a lock for releasably holding the head spaced away from the collar, said lock comprising: an elongated tube separate from the head, the plunger and the collar, said tube surrounding the plunger between the head and the collar, one end of the tube being adjacent the head, the opposite end of the tube being adjacent the collar, said tube having a longitudinal slot open at said one end of the tube and adapted to receive the rib, said slot extending from said one end of the tube toward the collar and having a terminus in spaced relation to said opposite end of the tube, said tube being rotatable with respect to the head, the plunger and the collar about the axis of reciprocation of the plunger from a first position disposing said one end of the tube in abutting relation to the rib and the opposite end of the tube in abutting relation to the collar, to a second position aligning the slot with the rib for movement of the latter along the slot toward said terminus as the head is moved toward the collar.
 7. In a pump as claimed in claim 2, said head having a cavity for receiving the tube when the latter is in said second position and as the head is moved toward the collar.
 8. In a pump as claimed in claim 2, said head and said collar each being provided with means rotatably receiving the tube and holding the axis of rotation thereof fixed relative to the plunger. 